Lossnay Replacement Pre Filters LGH F1200RX5 E1 8 Pack Ductless Filters Replace sooner if the airflow Anti Allergy Enzyme Filters:Four Anti Allergy (4) Replace sooner if the airflow decreases or the pressure gauge reading exceeds the manufacturer’s recommended limit 0 coarse pre filter captures particles 100+ microns washable and reusable or disposable Stage 2 H1902 — 2" pleated particulate pre filter captures particles 10–100 microns Stage 3 (optional) VL2002 — 2" VAPOR LOCK® high capacity carbon filter for gases and odors not included replaces or supplements Stage 2 Final Stage HEPA H2418 99 — high capacity metal frame HEPA filter certified 99 Regularly replacing pre filters helps extend the life of core filters This Set Includes Eight (8) Pre filters